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原文地址为:
class="tags" href="/tags/JAVA.html" title=java>java 中int Stringclass="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换
转载请注明本文地址: class="tags" href="/tags/JAVA.html" title=java>java 中int Stringclass="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换
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int -> String
int i=12345;
String s="";
第一种方法:s=i+"";
第二种方法:s=String.valueOf(i);
这两种方法有什么区别呢?作用是不是一样的呢?是不是在任何下都能互换呢?
String -> int
s="12345";
int i;
第一种方法:i=Integer.parseInt(s);
第二种方法:i=Integer.valueOf(s).intValue();
这两种方法有什么区别呢?作用是不是一样的呢?是不是在任何下都能互换呢?
以下是答案:
第一种方法:s=i+""; //会产生两个String对象 第一种方法:i=Integer.parseInt(s);//直接使用静态方法,不会产生多余的对象,但会抛出异常 |
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1如何将字串 String class="tags" href="/tags/ZhuanHuan.html" title=转换>转换成整数 int?
A. 有两个方法:
1). int i = Integer.parseInt([String]); 或
i = Integer.parseInt([String],[int radix]);
2). int i = Integer.valueOf(my_str).intValue();
注: 字串转成 Double, Float, Long 的方法大同小异.
A. 有两个方法:
1). int i = Integer.parseInt([String]); 或
i = Integer.parseInt([String],[int radix]);
2). int i = Integer.valueOf(my_str).intValue();
注: 字串转成 Double, Float, Long 的方法大同小异.
2 如何将整数 int class="tags" href="/tags/ZhuanHuan.html" title=转换>转换成字串 String ?
A. 有叁种方法:
1.) String s = String.valueOf(i);
2.) String s = Integer.toString(i);
3.) String s = "" + i;
注: Double, Float, Long 转成字串的方法大同小异.
JAVA数据class="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换 ynniebo [收藏]
关键字 class="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换
出处
这是一个例子,说的是JAVA中数据数型的class="tags" href="/tags/ZhuanHuan.html" title=转换>转换.供大家学习引
package cn.com.lwkj.erts.register;
class="tags" href="/tags/IMPORT.html" title=import>import class="tags" href="/tags/JAVA.html" title=java>java.sql.Date;
public class TypeChange {
public TypeChange() {
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the int type
public static int class="tags" href="/tags/STRING.html" title=string>stringToInt(String intstr)
{
Integer class="tags" href="/tags/INTEGER.html" title=integer>integer;
class="tags" href="/tags/INTEGER.html" title=integer>integer = Integer.valueOf(intstr);
return class="tags" href="/tags/INTEGER.html" title=integer>integer.intValue();
}
//change int type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String intToString(int value)
{
Integer class="tags" href="/tags/INTEGER.html" title=integer>integer = new Integer(value);
return class="tags" href="/tags/INTEGER.html" title=integer>integer.toString();
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the class="tags" href="/tags/FLOAT.html" title=float>float type
public static class="tags" href="/tags/FLOAT.html" title=float>float class="tags" href="/tags/STRING.html" title=string>stringToFloat(String class="tags" href="/tags/FLOAT.html" title=float>floatstr)
{
Float class="tags" href="/tags/FLOAT.html" title=float>floatee;
class="tags" href="/tags/FLOAT.html" title=float>floatee = Float.valueOf(class="tags" href="/tags/FLOAT.html" title=float>floatstr);
return class="tags" href="/tags/FLOAT.html" title=float>floatee.class="tags" href="/tags/FLOAT.html" title=float>floatValue();
}
//change the class="tags" href="/tags/FLOAT.html" title=float>float type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String class="tags" href="/tags/FLOAT.html" title=float>floatToString(class="tags" href="/tags/FLOAT.html" title=float>float value)
{
Float class="tags" href="/tags/FLOAT.html" title=float>floatee = new Float(value);
return class="tags" href="/tags/FLOAT.html" title=float>floatee.toString();
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the sqlDate type
public static class="tags" href="/tags/JAVA.html" title=java>java.sql.Date class="tags" href="/tags/STRING.html" title=string>stringToDate(String dateStr)
{
return class="tags" href="/tags/JAVA.html" title=java>java.sql.Date.valueOf(dateStr);
}
//change the sqlDate type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String dateToString(class="tags" href="/tags/JAVA.html" title=java>java.sql.Date datee)
{
return datee.toString();
}
public static void main(String[] args)
{
class="tags" href="/tags/JAVA.html" title=java>java.sql.Date day ;
day = TypeChange.class="tags" href="/tags/STRING.html" title=string>stringToDate("2003-11-3");
String strday = TypeChange.dateToString(day);
System.out.println(strday);
}
1.) String s = String.valueOf(i);
2.) String s = Integer.toString(i);
3.) String s = "" + i;
注: Double, Float, Long 转成字串的方法大同小异.
JAVA数据class="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换 ynniebo [收藏]
关键字 class="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换
出处
这是一个例子,说的是JAVA中数据数型的class="tags" href="/tags/ZhuanHuan.html" title=转换>转换.供大家学习引
package cn.com.lwkj.erts.register;
class="tags" href="/tags/IMPORT.html" title=import>import class="tags" href="/tags/JAVA.html" title=java>java.sql.Date;
public class TypeChange {
public TypeChange() {
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the int type
public static int class="tags" href="/tags/STRING.html" title=string>stringToInt(String intstr)
{
Integer class="tags" href="/tags/INTEGER.html" title=integer>integer;
class="tags" href="/tags/INTEGER.html" title=integer>integer = Integer.valueOf(intstr);
return class="tags" href="/tags/INTEGER.html" title=integer>integer.intValue();
}
//change int type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String intToString(int value)
{
Integer class="tags" href="/tags/INTEGER.html" title=integer>integer = new Integer(value);
return class="tags" href="/tags/INTEGER.html" title=integer>integer.toString();
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the class="tags" href="/tags/FLOAT.html" title=float>float type
public static class="tags" href="/tags/FLOAT.html" title=float>float class="tags" href="/tags/STRING.html" title=string>stringToFloat(String class="tags" href="/tags/FLOAT.html" title=float>floatstr)
{
Float class="tags" href="/tags/FLOAT.html" title=float>floatee;
class="tags" href="/tags/FLOAT.html" title=float>floatee = Float.valueOf(class="tags" href="/tags/FLOAT.html" title=float>floatstr);
return class="tags" href="/tags/FLOAT.html" title=float>floatee.class="tags" href="/tags/FLOAT.html" title=float>floatValue();
}
//change the class="tags" href="/tags/FLOAT.html" title=float>float type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String class="tags" href="/tags/FLOAT.html" title=float>floatToString(class="tags" href="/tags/FLOAT.html" title=float>float value)
{
Float class="tags" href="/tags/FLOAT.html" title=float>floatee = new Float(value);
return class="tags" href="/tags/FLOAT.html" title=float>floatee.toString();
}
//change the class="tags" href="/tags/STRING.html" title=string>string type to the sqlDate type
public static class="tags" href="/tags/JAVA.html" title=java>java.sql.Date class="tags" href="/tags/STRING.html" title=string>stringToDate(String dateStr)
{
return class="tags" href="/tags/JAVA.html" title=java>java.sql.Date.valueOf(dateStr);
}
//change the sqlDate type to the class="tags" href="/tags/STRING.html" title=string>string type
public static String dateToString(class="tags" href="/tags/JAVA.html" title=java>java.sql.Date datee)
{
return datee.toString();
}
public static void main(String[] args)
{
class="tags" href="/tags/JAVA.html" title=java>java.sql.Date day ;
day = TypeChange.class="tags" href="/tags/STRING.html" title=string>stringToDate("2003-11-3");
String strday = TypeChange.dateToString(day);
System.out.println(strday);
}
}
转载请注明本文地址: class="tags" href="/tags/JAVA.html" title=java>java 中int Stringclass="tags" href="/tags/LeiXingZhuanHuan.html" title=类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换>类型class="tags" href="/tags/ZhuanHuan.html" title=转换>转换